Orientation-selective adaptation to first- and second-order stimuli in human visual cortex measured with fMRI
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TL;DR: Tilt aftereffect shows cross-adaptation between firstand second-order stimuli Orientation-selective adaptation increases with level in cortical hierarchy.
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Abstract: [1] Kwan L, Regan D (1998) Vision Res 38:3489-3855 [2] Arsenault AS, Wilkinson F, Kingdom FAA (1999) J. Opt. Soc. Am. A. 16:427-435 [3] Mareschal I, Baker CL (1998) Nature Neurosci. 1:150-154 [4] Grosof DH, Shapley RM, Hawken MJ (1993) Nature 365:550-2 [5] von der Heydt R, Peterhans E, Baumgartner G (1984) Science 224:1260-2 [6] Grill-Spector K, Malach R (2001) Acta Psychol (Amst). 107:293-321 [7] Engel SA, Furmanski CS (2001) J Neurosci. 21:3949-54 [8] Huk AC, Ress D, Heeger DJ (2001) Neuron 32:161-72 [9] Larsson J (2001) Imaging vision. PhD Thesis. Karolinska Institutet, Stockholm, Sweden. ISBN: 91-7349-090-3 http://www.cns.nyu.edu/~jonas/software.html [10] Boynton GM, Finney EM (2003) J Neurosci. 23:8781-7 [11] Wichmann FA, Hill NJ (2001) Perception and Psychophysics 63:1293-1313 http://bootstrap-software.org/psignifit L C 3.5o 1.5o Tilt aftereffect shows cross-adaptation between firstand second-order stimuli Orientation-selective adaptation increases with level in cortical hierarchy
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Orientation-selective adaptation to first- and second-order patterns in human visual cortex
TL;DR: An adaptation protocol was used to measure neural activity in the human brain selective for the orientation of second-order textures and no consistent effect of adaptation was found in the cross-modal condition LM:OM, in agreement with psychophysical evidence for weak interactions between first- and second- order stimuli and computational models of separate mechanisms for first-and second-orders visual processing.
Human primary visual cortex (V1) is selective for second-order spatial frequency
TL;DR: It is concluded that neurons in human visual cortex are selective for second-order SF, that normalization (surround suppression) contributes to this selectivity, and that the selectivity in higher visual areas is simply fed forward from V1.
Perception of second- and third-order orientation signals and their interactions.
TL;DR: Examination of segmentation performance for visual textures in which the strengths of different kinds of orientation cues were varied independently, while controlling potential confounds such as differences in luminance statistics found that corners provide a stronger signal for texture segregation than can be accounted for by their individual effects.
Phase-Dependent Interactions in Visual Cortex to Combinations of First- and Second-Order Stimuli.
TL;DR: It is demonstrated that neuronal responses to these compound stimuli are highly dependent on the relative phase between the LM and CM components, which place important constraints on any future model of the underlying neural circuitry for second-order responses.
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Global shape processing involves feature-selective and feature-agnostic coding mechanisms.
TL;DR: This work measured a RF amplitude aftereffect (RFAAE) as a function of the shape orientation difference between adapt and test patterns of the same RF and provided evidence for two global shape mechanisms: one that is selective for shape orientation and luminance polarity, andOne that is agnostic to these characteristics.